B.TECH - Semester 6 heat and mass transfer Question Paper 2020 (sep)
Practice authentic previous year university questions for better exam preparation.
- Define Prandtl number. What is its significance?
- A counterflow double pipe heat exchanger using superheated steam is used to heat water at the rate of $10000 \mathrm{~kg} / \mathrm{h}$. The steam enters the heat exchanger at $180^{\circ} \mathrm{C}$ and leaves at $130^{\circ} \mathrm{C}$. The inlet and exit water temperature are $30^{\circ} \mathr...
- State and explain Fick's law of diffusion. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{4 0}$ Marks)
- Give the analogy between conduction heat transfer and mass diffusion.
- With necessary assumptions derive the general heat conduction equation in cylindrical co-ordinates.
- Distinguish between fin efficiency and fin effectiveness.
- Two large parallel plates at temperature 1000 K and 500 K have emissivity of 0.5 and 0.8 respectively. A radiation shield having emissivity 0.1 on one side and 0.05 on the other side is placed between the plates. Calculate the heat transfer by radiation per square meter with and without radiation sh...
- Explain conduction shape factor and its uses.
- Show by dimensional analysis, Nusselt number is a function of Reynolds number and Prandtl number.
- What are the different modes of heat transfer? State the Fourier's law of heat conduction.
- What is thermal diffusivity? Explain its significance.
- Compare LMTD method and NTU method for heat exchanger analysis.
- Explain Wein's displacement law.
- Consider a hemispherical furnace with flat circular base. Determine the shape factor for radiation from the dome of this furnace to its base.
- A cold storage room has walls made of 23 cm of brick on the outerside, 8 cm plastic foam and finally 1.5 cm of wood on the inside. The outside and inside temperature are 22 and $-2^{\circ} \mathrm{C}$ respectively. The inside and outside heat transfer coefficients are 29 and $12 \mathrm{~W} / \mathr...
- Derive the equation for diffusion mass flow rate in steady state diffusion through a plane membrane. ( $\mathbf{3} \boldsymbol{\times} \mathbf{2 0} \boldsymbol{=} \mathbf{6 0}$ Marks)
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